After the Deadline for OpenOffice.org is a smart English grammar, style, and contextual spelling checker for OpenOffice.org. The grammar checker highlights common errors in your writing. The style checker (off by default) finds passive voice, clichés, redundant phrases, and complex expressions. The contextual spelling checker looks for misused words and reports them to you. This extension communicates with an open source software service to check your writing. You may run your own server or use that provided by afterthedeadline.com. Text sent to afterthedeadline.com is sent over SSL and none of it is kept.

Hspell is a Hebrew linguistic project. It features
a Hebrew spell-checker, and aims to use the
databases and algorithms developed as a morphology
engine (for example, for search engines), and in
the future for advanced things like Hebrew speech
synthesis.

The PHP Spell Check component adds fast, reliable spell-checking to Web sites and intranets. Installed on either IIS and Apache Servers, it works on all major modern Web browsers. It features as-you-type spell checking with wiggly red underlines, Did-You-Mean search phrase suggestions, and a collection of free dictionaries.